I *think* that you can get away without the need for a new claim – JUST.
Assuming HB is going to be payable for “week 1” at the new address, it is open to argument that HB is continuous, despite the occupancy “gap”. If I was representing the clmt, I’d argue as follows:
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Even if the LA decides that any liability for 18th/19th is ineligible for HB, the clmt is still entitled to HB for the WHOLE week because HBR 80 doesn’t end benefit; it merely acts as a calculating mechanism for an apportioned amount of rent for which HB can be paid FOR THE WHOLE WEEK. Except where expressly provided, HB is a weekly benefit, payable for full weeks and, on that basis, HB is continuous in this case because there are no benefit weeks where there is no entitlement. None of the provisions that could end HB mid-week apply in this case.
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As it happens, it may well be arguable that in these specific circs, rent for 18th / 19th may well be eligible for HB in any case. However, I’ve not analysed that aspect and I’m out of gas….